body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background-color: #0d1117;
  color: white;
  padding: 20px;
}

.title {
  text-align: center;
  margin-bottom: 20px;
  font-size: 2rem;
  color: #f1f1f1;
}

#heatmap-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 15px;
}

.crypto-box {
  aspect-ratio: 1 / 1;
  border-radius: 12px;
  padding: 12px;
  color: white;
  background: #222;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
  transition: transform 0.2s, background 0.3s ease;
}

.crypto-box:hover {
  transform: translateY(-5px);
}

.crypto-box .symbol {
  font-weight: 600;
  font-size: 1.1rem;
}

.crypto-box .price {
  font-size: 1rem;
  margin: 4px 0;
}

.crypto-box .change {
  font-size: 0.9rem;
  opacity: 0.85;
}

.green {
  background: linear-gradient(135deg, #16c784, #0e9f6e);
}

.red {
  background: linear-gradient(135deg, #ea3943, #c92a2a);
}